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Error code reference

Bosch Refrigerator Error Code E2003

CRC parameter set (IW210/Icemaker)

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CRC parameter set (IW210/Icemaker)

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What E2003 means on a Bosch refrigerator

Error code E2003 on a Bosch refrigerator indicates a CRC (Cyclic Redundancy Check) parameter set error related to the IW210 icemaker module. A CRC error means the control system has detected a mismatch or corruption in the stored configuration data associated with the icemaker. The control board continuously checks that the icemaker's programmed parameters match expected checksum values, and when the verification fails, E2003 is triggered to flag the data integrity problem.

This type of error typically originates in the icemaker's onboard memory or in the communication between the icemaker module and the main control board. The stored parameter set contains operational settings such as harvest cycles, temperature thresholds, and timing sequences. If this data becomes corrupted due to a power surge, a faulty module, or a failed firmware write, the CRC check will not pass and the icemaker will be disabled until the issue is resolved.

Common triggers include power interruptions during a control board update, a failing icemaker module (IW210) with degraded internal memory, or a wiring fault causing intermittent communication errors between the icemaker and the refrigerator's main board. Because the error is rooted in stored configuration data rather than a straightforward sensor or mechanical failure, resetting the unit or replacing the icemaker module is often required to restore normal operation.

Source: manufacturer service documentation.

Common causes of E2003

  1. 01

    Corrupted icemaker module memory

    Part replacement

    The IW210 icemaker module stores its own configuration data, and if that memory becomes corrupted due to a power event or component aging, the CRC check will fail. Replacing the icemaker module is typically the resolution.

  2. 02

    Power surge or interruption

    Wiring / connection

    A sudden loss of power or a voltage spike during normal operation can corrupt the stored parameter set in the icemaker module. If the error appeared shortly after a power outage or electrical disturbance, this is a likely cause.

  3. 03

    Faulty wiring or connector to icemaker

    Wiring / connection

    A loose, corroded, or damaged wiring harness between the main control board and the IW210 icemaker can cause intermittent communication failures that result in CRC errors. Inspect the connector at both ends for damage or moisture.

  4. 04

    Main control board fault

    Part replacement

    If the main control board is unable to correctly read or write configuration data to the icemaker, it may generate a false CRC mismatch. This is less common but should be considered if replacing the icemaker module does not clear the error.

  5. 05

    Failed or incomplete software update

    Wiring / connection

    If the icemaker module underwent a firmware or parameter update that did not complete successfully, the resulting incomplete data set will fail the CRC check. A technician may need to re-flash or reconfigure the module.

See the test procedure for each cause

Frequently asked questions about E2003

What does E2003 mean on a Bosch refrigerator?
E2003 indicates a CRC parameter set error associated with the IW210 icemaker module. The refrigerator's control system performs a cyclic redundancy check on the icemaker's stored configuration data and has detected that the data is corrupted or invalid. This typically causes the icemaker to stop functioning until the issue is corrected.
Will resetting my Bosch refrigerator clear the E2003 error?
A power reset may temporarily clear the error if it was caused by a one-time power interruption, but if the icemaker module's memory is genuinely corrupted, the error will return after the control system re-runs its CRC check. A reset is worth attempting as a first step, but a persistent E2003 usually requires component-level diagnosis or replacement.
How do I fix the E2003 error on my Bosch refrigerator?
Start by unplugging the refrigerator for several minutes and restoring power to see if the error clears. If E2003 returns, inspect the wiring harness and connectors leading to the icemaker for damage or corrosion. If the wiring is intact, the IW210 icemaker module itself likely needs to be replaced, and in some cases the main control board may also need evaluation.
Is it safe to use my Bosch refrigerator while E2003 is displayed?
The E2003 error is specific to the icemaker module and does not directly affect the refrigerator's cooling or food preservation functions. The refrigerator compartment and freezer should continue operating normally. However, the icemaker will likely be non-functional until the error is resolved, so you should plan to use an alternative ice source in the meantime.
How much does it cost to fix the E2003 error on a Bosch refrigerator?
Repair costs depend on the root cause. If only the IW210 icemaker module needs replacement, parts and labor typically range from around $150 to $350. If the main control board is also involved, total costs can be higher, often in the $250 to $500 range depending on parts pricing and local labor rates. Getting a professional diagnosis first can help avoid replacing parts unnecessarily.

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